Chair with adjustable armrests and backrest

Abstract

A task chair including a base, a seat supported by the base, and a pair of uprights connected to the base and extending upwardly from the seat. A pair of armrests are attached respectively to the uprights, and are selectively positionable along the uprights in a manner in which the height of the armrests along the uprights is adjustable. A backrest is also selectively positionable along the uprights, and the height of the backrest with respect to the seat may be adjusted by moving the backrest upwardly or downwardly along the uprights. The armrests and backrest each include mount sleeves telescopingly slidable along the uprights, each of the mount sleeves including a user-operable adjustment mechanism which includes a lever having a portion thereof selectively engagable with one of a series of holes along the uprights. The adjustment mechanisms of the mount sleeves of the armrests and the backrest are easily operated by a user to independently adjust the armrests and the backrest vertically along the uprights.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to chairs, such as task chairs of the type which are used in an office or other workplace setting. In particular, the present invention relates to a task chair having adjustable armrests and an adjustable backrest. [0003] 2. Description of the Related Art [0004] Task chairs are used for seating users while working in an office or another workplace environment, and include a seat, a backrest, and optionally, a pair of armrests. A base assembly supports the seat, backrest, and armrests, and usually includes one or more adjustment features for adjusting the movement characteristics of the chair, such as seat height, seat depth, seat tilt, or resistance to reclining of the backrest, for example. The armrests may also include adjustment features for adjusting the movement characteristics of the armrests, such as the height of the armrests, and pivotal or lateral movement of the armrests, for...

AI Technical Summary

Benefits of technology

[0008] The present invention provides a task chair including a base, a seat supported by the base, and a pair of uprights connected to the base and extending upwardly from the seat. A pair of armrests are attached respectively to the uprights, and are selectively positionable along the uprights in a manner in which the height of the armrests along the uprights is adjustable. A backrest is also selectively positionable along the uprights, and the height of the backrest with respect to the seat may be adjusted by moving the backrest upwardly or downwardly along the uprights. The armrests and backrest each include mount sleeves telescopingly slidable along the uprights, each of the mount sleeves including a user-operable adjustment mechanism which includes a lever having a portion thereof selectively engagable with one of a series of holes along the uprights. The adjustment mechanisms of the mount sleeves of the armrests and the backrest are easily operated by a user to independently adjust the armrests and the backrest vertically along the uprights.

[0009] The base of the chair may include a “spider”-type leg assembly, including a plurality of legs including casters for rolling movement of the chair along a floor surface. Alternatively, the base of the chair may include a set of fixed chair legs. A pneumatic height-adjusting cylinder connects the base assembly with a control housing of the chair, and allows vertical height adjustment of the chair with respect to the floor surface. The control housing is an existing component available from many commercial sources, and may facilitate one ore more adjustable movement characteristics of the chair, such as seat depth or tilt adjustments, or adjustment of the resistance of reclining of the seat and / or backrest.

[0010] The uprights may take the form of a U-shaped yoke member having a base portion and leg portions, with the base portion connected to the seat support structure beneath the seat. The uprights extend upwardly from opposite sides of the seat proximate the rear portion of the seat, and each include a series of holes therealong. The armrests and backrest each include mount sleeves telescopingly slidable along the uprights. Each of the mount sleeves include an adjustment mechanism for selectively positioning the armrests and the backrest in selected positions along the uprights. Advantageously, in this manner, both the armrests and the backrest are commonly attached to the uprights, which greatly simplifies the overall structure of the chair, and obviates the need for separate structures connecting the backrest and the armrests to the chair base.

[0011] The adjustment mechanisms of the mount sleeves of the armrests and the backrest each include a lever pivotally mounted within a recessed cavity in the mount sleeves, and the lever is easily visible and operable by a user. The lever is movable between a first position in which a portion of the lever engages one of the holes in the upright to fix the position of the mount sleeves of the armrests and the backrest with respect to the uprights, and a second position in which the portion of the lever is released from the hole to allow vertical, sliding adjustment of the mount sleeves of the armrests or the backrest with respect to the uprights. Thus, the vertical positions of the armrests and the backrest are easily manually adjustable by a user to conform to the posture of the user.

Problems solved by technology

Problematically, the operation of the manual adjustment features of many known task chairs is often not intuitive to the user, and may require a type of learning process on the part of the user, in which the user first locates the various adjustment controls on the chair, and then figures out how to manipulate the controls to adjust the movement characteristics of the chair.

Also, the adjustment controls in many known task chairs are mechanically complex and expensive to manufacture.

Additionally, the backrests of many task chairs are not vertically adjustable, but rather are located in a fixed vertical position relative to the seat.

Thus, in many known task chairs, the backrest is not adjustable for users of different height.

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